---
title: "CVE-2025-3248: Langflow Missing Authentication Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-3248/
description: "CVE-2025-3248 (Langflow Langflow): Exploited in the wild (CISA KEV). Langflow versions prior to 1.3.0 are susceptible to code injection in the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-04-07
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-3248"
kev: true
cvss: 9.3
epss: 0.99993
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-3248: Langflow Missing Authentication Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Langflow Langflow. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-05-05, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-05-26 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 100.0% , percentile 100.0: FIRST’s model estimates a 100.0% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes langflow (PyPI) < 1.3.0, fixed in 1.3.0 ; langflow-base (PyPI) < 0.3.0, fixed in 0.3.0 . Check your lockfile, including transitive dependencies.
- Editorial verdict: Check exposure. Langflow Unauthenticated Code Execution (CVE-2025-3248) — Fixed in March 2025 and exploited in the wild since; if any Langflow below 1.3.0 is reachable from the internet, treat it as compromised, not merely unpatched.

## What it is

Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.

## Affected packages

- PyPI `langflow` < 1.3.0 → fixed: 1.3.0
- PyPI `langflow-base` < 0.3.0 → fixed: 0.3.0

## Affected products (CVE record)

- langflow-ai langflow: < 1.3.0

## Severity

- VulnCheck CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A`

## Exploitation

- CISA KEV: added 2025-05-05; federal due date 2025-05-26. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 99.99% probability of exploitation activity in the next 30 days; percentile 100.0.

## Sources

- [github.com](https://github.com/langflow-ai/langflow/releases/tag/1.3.0)
- [Listed in CISA KEV notes (github.com)](https://github.com/advisories/GHSA-c995-4fw3-j39m)
- [GitHub Advisory GHSA-rvqx-wpfh-mfx7](https://github.com/advisories/GHSA-rvqx-wpfh-mfx7)
- [CVE.org record CVE-2025-3248](https://www.cve.org/CVERecord?id=CVE-2025-3248)
- [NVD entry CVE-2025-3248](https://nvd.nist.gov/vuln/detail/CVE-2025-3248)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3248)
- [github.com](https://github.com/langflow-ai/langflow/pull/6911)
- [horizon3.ai](https://www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-python-exec-for-unauth-rce-in-langflow-ai/)
- [vulncheck.com](https://www.vulncheck.com/advisories/langflow-unauthenticated-rce)
- [github.com](https://github.com/langflow-ai/langflow/security/advisories/GHSA-rvqx-wpfh-mfx7)
- [github.com](https://github.com/langflow-ai/langflow/commit/faac4db133de32fcb6d483fa9ff52f40ce42bdc0)

---
Source page: https://erroneo.us/security/cve/CVE-2025-3248/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt